Synthesis and Characteristics of Thermo-and pH-Sensitive PNIPAAm/PVP Hydrogels

Abstract:

Poly (N-isopropylacrylamide)(PNIPAAm)/Poly (N-vinylpyrrolidone)(PVP) hydrogels were prepared by irradiating the aqueous solution mixture of NIPAAm and PVP with electron beam. The effects of feed ratio, pH, and temperature on the swelling ratio of the hydrogels were investigated. It appeared that the hydrogels possessed both pH and temperature sensitivity, the lower critical solution temperature (LCST) of PNIPAAm/PVP hydrogels increased with the increasing of PVP content in the copolymers. The experimental results also showed that the hydrogels were ionic strength sensitivity, the swelling ratio decreased sharply when the ionic strength of the solution arrived to a certain critical value.

• Periodical: Advanced Materials Research (Volume 787)
• Pages: 190-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.787.190
• Online since: September 2013
• Authors: Zhi Jun Li
• Keywords: Hydrogel, Ionic Strength Sensitivity, N-Isopropylacrylamide, pH Sensitivity, Poly(N-Vinylpyrrolidone), Temperature Sensitivity

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